Question

The function $f\left(x\right)=|x^2-2x-3|\cdot e^{|9x^2-12x+4|}$ is not differentiable at exactly :

• A. One point
• B. Four points
• C. Two points
• D. Three points

Answer 1

The correct option is C Two points

$f\left(x\right)=|(x+1)(x-3)|.e^{(3x-2{)}^2}$
Clearly $f\left(x\right)$ is not differentiable at $x=-1$ and $3$